Polishing tool



R. M. KINCAID POLISHING TOOL Jan. 5, 1932.

Filed July 2'1, 1929 RlELL M m 0,475

4 ATTORNEY nism, such as aflexible cable, not shown.

Patented Jan. 5, 1932 UNITED STATES vPA TENT OFFICE RUSSELL M. KINOLID, F DETROIT, MICHIGAN, ASSIGNOR 'IO CHRYSLER CORPORATION, OF DETROIT, MICHIGAN, ACORCPOIQATION OF DELAWARE POLISHIN G TOOL Application filed July 27,

This invention relates to a polishing machine and is illustrated as embodied in a manually supported device particularly adapted for use in polishing vehicle bodies. 7

Heretofore machines intended for this use have had a reciprocating movement and it has been found that when the machines are in use there is considerable vibration and that such vibration is caused b the harmonic movement of the reciprocating or polishing member. It is, therefore an important object of the invention to provide a reciprocating member, the movement of which is progressively decreased throughout its movement in either direction. f

-"Other objects and advantages of the invention wiILmore fully appear from the following description taken in connection with the accompanyin drawings, in which:

Fig.1 isTa sicfie elevation illustrating an embodiment of my inventionr Fig. 2 is a sectional viewon line 2-2 of Fig.1. 1 y p Fig. 3 is a bottom view taken on line 3-3 85' of Fig. '1, showing in elevation the under- J surface of the tool with the abrasive holding member removed. g g Referring to the drawings wherein I have illustrated a preferred form of my device, so the reference numeral 10 designates a block having lateral secured to the block 10 such. as by bolts 14. The upper surface of the block 10 is provided g with a screw threaded, boss 16' which receives "ahan'dle portion 18, the attaching portion of which is hollowed outto-form'a gear-housin L 20. Extending at right angles to the handle portion 18 is a boss .22 "carrying a shaft 24 adapted to engage a suitable driving mecha- Thelateral flanges '12 have their lower ends'turned in under the block 10, as at 26, to provide a retaining means and a guide for the reciprocating member.

1 The reciprocating member comprises a plate 28 havin'gupper and lower plates 30 extending beyond the opposite sides of the plate 28. The portions 26 of the plates 12 are received between the plates 30.- p

Mounted within the housing 20 and driven movement to the plates 12 which are detachably 1925. Serial no. 381,621.

by the shaft 24 is a pinion 32 meshing with a gear 34, keyed to a shaft 36 journaled in the blocker body portion 10. The lower end of the shaft 36 is provided with a flange 38 recessed in the block 10 and an eccentrically mounted pin .40 extends downwardly from the flange 38. A roller 42 is carried by the pin 40. The. pin 40 and roller 42 are received in a slot 44 in the plates 28 and 30. It will be understood that rotation of the shaft 36 and eccentric pin 40 imparts reciprocating plates 28 and 30guided by the flanges 26.

' Heretofore slots of this nature have been provided, but such slots have extended at right angles to the direetionof the reciproeating. movement. By the arrangement of a slot in this manner the reciprocating member, at the beginning of its movement in one direction, movesat a speed equal to the speed at the end of the movement. Such movement causes considerable vibration. It has been found that by extending the sloton 'an'angle less than 90 degrees the speed of the movement at the beginning of the stroke can be varied relative to thespeed of the movement at theend of the stroke Y To move the reciprocating member one half of its distance in'one direction it is desirable to have it travel the one half distance in one third of-the; time that it takes to travel the entire distance in-one direction, and to complete'its movement'for the remaining half distance in two thirds of the time that it takes to move the entire .distance. On the return g movement it isagain desirable to move the reciprocating member in the opposite direction one half of its returndistance in one third of the time and the remaining half of the distance in two thirds of thetime. It

will be understood that in making'a complete cycle the reciprocating member starts its 'movementin one direction very rapidly and decreases its speed toward the end of its movement in that same direction. NVhen the o5 reciprocating member is returned the speed is comparatively fast and is again slowed up at the end of its return movement, thus breaking up the harmonic movement of the recipculed -toa plate 56 asa unit and the opposite rocating member and eliminating vibration distance of its travel.

of the device.

Itwill be understood that the angle at which the slot 44 extends may be varied, de-

- pendin on the amount of time required to from a line at'right. angles to the direction of travel of the reciprocating member ismost I I the direction of travel of the reciprocating desirable. I

- As shown on the drawings, three locking plates 46 have beensecuredto the reciprocating member and each are adapted to detachably receive an abrasive member-'48. One face, of the locking. member is dove-tailed,

; as shown at 50, and the-opposite face 52 thereof is dovetailed and detachably se cured to the locking inemher 46, such as by screws 54. The locking members 46 are seends of the plate 56 are turned upwardly,

as'at58.' The outer ends ofthe upwardly extending portion 58 are bent inwardly, as at60, and snap overthe upper plate 30 to secure the unit on the reciprocatingmember..-

. reciprocating member.

her and a lineparallelto the direction of travel of the reciprocating member, an eccentrically movable member in theslot, and a detachable abrasive member carried by said 4. .A polishing tool of the class described comprising a body. portion, a rotatable memdeer in said body portion, a reciprocating member o'n one face of said body portion hav- N ing a slot arranged'diagonally with respect to .;comprising abody portion, a reciprocating member on one face of said body portion, an abrasive member CHI'IIGd'by sald reclprocating member, and means for moving said reciprocating member in one direction, first at a relatively high rate of speed and then at a relatively slow-rate of speed.

" RUSSELL M. KINCAID.

It will be understood that. the upwardly exi tending arms 58 are resilient and can be snapped-over the endsof the reciprocating member.

Various chahgesIincluding the size, shape and'arrangement ofpa rts, may be 'made with:

I out departing from the spirit, of my invention and it-is not my intentionto limit its scope other than by the terms of the appended claims. f

What I claim is:

'1. A device of the r on the lower surface of said he y portion, a rotatable member in said body portion,' an eccentrically-mounted pinonsaid rotatablemember in driving engagement" with said reciprocating member, said'recipclass described com- Ezising a body portion, a reciprooatin mem to the direction of movement of the rec1pro-'- eating member for the reception of the eccentrically mounted 2. A device of the class described comprisi'ng a body portion a reciproca carried by said body portion h a v inga slot proximately 26 degrees to a line at right angles to the direction of movement of there ciprocating member, a rotatable member in said body portion, and an .eccentrically' mounted pin on said rotatable member recomprismga manually supported body pormemberj extending in adirection at an angle of ap-- tion, areciprocating member carried bysaid body portion having a slot extending in a direction between a. lme 'at right angles to: the I direction of travel ofthe-reciprocating mem- 

